Cong Li1, Shibo Lin1, Wei Guan1, Jiajia Shen1, Hui Liang2. 1. Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu, China. 2. Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu, China. drhuiliang@126.com.